[SLING-5621] Add InitDelayingTopologyEventListener, a listener that can delay the first INIT event

• Type: New Feature
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Discovery Commons 1.0.10
• Fix Version/s: Discovery Commons 1.0.12
• Component/s: Extensions
• Assignee: Stefan Egli
• Reporter: Stefan Egli
• Created: 21/Mar/16 14:15
• Updated: 12/Apr/16 11:58
• Resolved: 21/Mar/16 14:16

Description

InitDelayingTopologyEventListener came up as part of SLING-5560: a TopologyEventListener that holds back events until a certain 'startup time' has passed, after which it will either send a TOPOLOGY_INIT (if the last held back event was either TOPOLOGY_INIT, TOPOLOGY_CHANGED or PROPERTIES_CHANGED) - or it waits for the next such stable event (when it got a TOPOLOGY_CHANGING as the last event). This could be of general use, hence moved it from sling.event to sling.discovery.commons. At this stage this is a plain listener class - perhaps this could be made something like a property of a listener at some later point - but at this stage this simple approach seems good enough.

Issue Links

• relates to: SLING-5560 Delay job processing at startup to avoid unnecessary stale job handling